package com.atguigu.Dao;

import com.atguigu.utils.JdbcUtils;
import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.handlers.BeanHandler;
import org.apache.commons.dbutils.handlers.BeanListHandler;
import org.apache.commons.dbutils.handlers.ScalarHandler;

import java.sql.Connection;
import java.sql.SQLException;
import java.util.List;

public class BaseDao {

    private QueryRunner queryRunner=new QueryRunner();


    public int update(String sql,Object...args){
        Connection connection= JdbcUtils.getConnection();

        try {
            return  queryRunner.update(connection,sql,args);
        } catch (SQLException e) {
            e.printStackTrace();
        }
        finally {
            JdbcUtils.close(connection);
        }
        return -1;
    }

     public <T> T queryForone(Class<T>type,String sql,Object...args){

        Connection con=JdbcUtils.getConnection();
         try {
             return  queryRunner.query(con,sql,new BeanHandler<T>(type),args);
         } catch (SQLException e) {
             e.printStackTrace();
         }finally {
             JdbcUtils.close(con);
         }
         return null;
     }

    public <T> List<T> queryForList(Class<T>type, String sql, Object...args){

        Connection con=JdbcUtils.getConnection();
        try {
            return  queryRunner.query(con,sql,new BeanListHandler<T>(type),args);
        } catch (Exception e) {
            e.printStackTrace();
        }finally {
            JdbcUtils.close(con);
        }
        return null;
    }



    public Object queryForSingleValue( String sql, Object...args){

        Connection conn=JdbcUtils.getConnection();
        try {
            return  queryRunner.query(conn,sql,new ScalarHandler(),args);
        } catch (Exception e) {
            e.printStackTrace();
        }finally {
            JdbcUtils.close(conn);
        }
        return null;
    }


}
